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《Acta Zoologica Sinica》 2002-01
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EFFECT OF TESTOSTERONE ON THE RELEASE AND SYNTHESIS OF GONADOTROPIN HYPOTHALAMUS-PITUITARY COMPLEX IN VITRO IN THE JAPANESE EEL (ANGUILLA JAPONICA)

DENG Yue-Song LIN Hao-Ran **- (School of Life Science, Zhongshan University, Guangzhou 510275, China)  
The effects of testosterone (T) on the synthesis and release of gonadotropin (GtH) in the hypothalamus pituitary complex or pituitary alone of Japanese eel (Anguilla japonica) were investigated in vitro. The intact hypothalamus-pituitary complex (HPC), the separate hypothalamus plus pituitary (H+P) or the pituitary (P) of male eel were incubated with TC 199 medium without (control) or with different concentrations of testosterone (0.1, 1.0, or 10.0 μmol/L) for 8 h. In the control group, the GtH content of HPC group was the highest both in medium or pituitaries while the P group was the lowest. It indicated that the gonadotropin-releasing hormone (GnRH) reaches pituitary directly. Incubation of pituitary alone with different concentrations of T increased the GtH content in a dose dependent manner either in medium or pituitary. We suggested that T acted directly as a positive feedback on the synthesis and release of GtH in eel pituitary. Low dosages of T (0.1 and 1.0 μmol/L) stimulated the synthesis and release of GtH in both HPC group and H+P group after 8 h incubation, indicating that there was a positive feedback effect of T on either hypothalamus or pituitary in eel; whereas a negative feedback effect of T were observed when HPC or H+P incubated with high dosage of T (10.0 μmol/L). In the highest dosage group, the inhibitory effect of GtH release was more significant than the GtH synthesis. These results demonstrated that the synthesis and release of pituitary GtH was regulated by hypothalamus via GnRH. Testosterone in male fish had feedback effects on either hypothalamus or pituitary in Japanese eel.
【Fund】: 国家自然科学基金资助项目 (No .39770 10 1)~~
【CateGory Index】: Q959.4
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【Citations】
Chinese Journal Full-text Database 1 Hits
1 DENG Yue-song ; LIN Hao-ran(School of Life Science, Zhongshan University, Guangzhou 510275);INDUCED GONADAL MATURATION BY SINGLE IMPLANTATION OF ANDROSTENEDIONE IN MALE Anguilla japonic[J];MARINE SCIENCES;2000-04
【Co-citations】
Chinese Journal Full-text Database 7 Hits
1 DENG Yue song 1, LIN Hao ran 2, XIE Jun 3, XU Zhi rong 1 (1. Feed Science Institute of Zhejiang University, Hangzhou 310029,China; 2. School of Life Science, Zhongshan University, Guangzhou 510275,China; 3. Pearl River Fisheries Researc;Induced ovarian development and maturation by implantation androstenedione enveloped silastic bar in female cultivated eel, Anguilla japonica[J];Journal of Dalian Fisheries University;2001-03
2 WANG Guang-jun XIE Jun PAN De-bo(Agriculture Ministry Key Laboratory Tropical and Subtropical Fishes Breeding and Cultivation, Chinese Academy of Fishery Sciences, Pearl River Fisheries Research Institute, Guangzhou, 510380);EFFECTS OF Ca~(2+), Mg~(2+) CONCENTRATI AND Ca~(2+)/Mg~(2+) ON HATCHING RATES FOR THE EGGS OF Anguilla japonica REARED IN ARTIFICIAL SEA WATER[J];Marine Sciences;2002-02
3 ZHOU Wen-yi1,HUANG Hai1,2,YIN Shao-wu1,QI Xin1,ZHANG Yong2,LIU Xiao-chun2,CHEN Guo-hua1,LIN Hao-ran1,2(1.College of Ocean,Hainan University,Key Laboratory of Tropical Biology Resources,Ministry of Education,Haikou 570228,China;2.Guangdong Provincial Key Laboratory for Aquatic Economic Animals, Sun Yat-Sen University,Guangzhou 510275,China);Artificial induction of testicular maturation and biological character of spermatozoa in marble eels(Anguilla marmorata)[J];Journal of Fisheries of China;2009-01
4 WEN Hai-Shen1,WANG Lian-Shun2,MOU Xing-Jiang1,CHEN Cai-Fang1,YAO Jun1,ZHOU Yu-Guo1,HE Feng1,SHI Bao1,CHEN Song-Lin3(1.Key Laboratory of Mariculture,Ministry of Education,Ocean University of China,Qingdao 266003,China;2.Dalian Fisheries University,Dalian 116023,China;3.Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Science,Qingdao 266071,China);Studies on Physiology Function on Testosterone and 17β-estradiol and It's Receptors During Testis Development of Hexagrammos otakii[J];Periodical of Ocean University of China;2009-05
5 WANG Guangjun~1,XIE Jun~1,YU Deguang~1,ZHU Hongyou~(1,2)(~1Key Laboratory of Tropical and Subtropical Fish Breeding and Cultivation,Pearl River Fishery Research Institute,Chinese Academy of Fishery Sciences,Guangzhou 510380,China;~2College of Life Science and Technology,Shanghai Fisheries University,Shanghai 200090,China);Induction of pond-cultivated Anguilla japonica gonadial development by controlling temperature in high temperature season[J];Chinese Journal of Applied Ecology;2005-11
6 WEN Hai shen,LIN Hao ran (Institute of Aquatic Economic Animal,Zhongshan University,Guangzhou 510275,China);Study advance on induction of gonadal development & maturation and reproductive performance by sustained hormone releasing delivery systems in marine fishes[J];Journal of Fishery Sciences of China;2002-02
7 DENG Yue-songSchool of Life Sciences, Zhongshan University, Guangzhou 510275,China,LIN Hao-ran;Effects of Osmolality and pH on Sperm motility of Japanese eel (Anguilla japonica)[J];ACTA SCIENTIARUM NATURALIUM UNIVERSITATIS SUNYATSENI;2000-04
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